mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 15:03:34 +00:00
7cf66bc161
This change introduces the nointernet() function which may be called to prevent a process and its descendants from communicating with publicly routable Internet addresses. GNU Make has been modified to always call this function. In the future Landlock Make will have a way to whitelist subnets to override this behavior, or disable it entirely. Support is available for Linux only. Our firewall does not require root access. Calling nointernet() will return control to the caller inside a new process that has a SECCOMP BPF filter installed, which traps network related system calls. Your original process then becomes a permanent ptrace() supervisor that monitors all processes and threads descending from the returned child. Whenever a networking system call happens the kernel will stop the process and wakes up the monitor, which then peeks into the child memory to read the sockaddr_in to determine if it's ok. The downside to doing this is that there can be only one supervisor at a time using ptrace() on a process. So this firewall won't be enabled if you run make under strace or inside gdb. It also makes testing tricky.
53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
#ifndef COSMOPOLITAN_TOOL_BUILD_LIB_XLAT_H_
|
|
#define COSMOPOLITAN_TOOL_BUILD_LIB_XLAT_H_
|
|
#include "libc/calls/struct/itimerval.h"
|
|
#include "libc/calls/struct/rusage.h"
|
|
#include "libc/calls/struct/sigset.h"
|
|
#include "libc/calls/struct/stat.h"
|
|
#include "libc/calls/struct/termios.h"
|
|
#include "libc/calls/struct/winsize.h"
|
|
#include "libc/sock/struct/sockaddr.h"
|
|
#include "tool/build/lib/bits.h"
|
|
#if !(__ASSEMBLER__ + __LINKER__ + 0)
|
|
COSMOPOLITAN_C_START_
|
|
|
|
int UnXlatSicode(int, int);
|
|
int UnXlatSignal(int);
|
|
int XlatAccess(int);
|
|
int XlatAdvice(int);
|
|
int XlatAtf(int);
|
|
int XlatClock(int);
|
|
int XlatErrno(int);
|
|
int XlatFcntlArg(int);
|
|
int XlatFcntlCmd(int);
|
|
int XlatLock(int);
|
|
int XlatMapFlags(int);
|
|
int XlatMsyncFlags(int);
|
|
int XlatOpenFlags(int);
|
|
int XlatOpenMode(int);
|
|
int XlatRusage(int);
|
|
int XlatSig(int);
|
|
int XlatSignal(int);
|
|
int XlatSocketFamily(int);
|
|
int XlatSocketFlags(int);
|
|
int XlatSocketLevel(int);
|
|
int XlatSocketOptname(int, int);
|
|
int XlatSocketProtocol(int);
|
|
int XlatSocketType(int);
|
|
int XlatWait(int);
|
|
|
|
void XlatSockaddrToHost(struct sockaddr_in *, const struct sockaddr_in_bits *);
|
|
void XlatSockaddrToLinux(struct sockaddr_in_bits *, const struct sockaddr_in *);
|
|
void XlatStatToLinux(struct stat_bits *, const struct stat *);
|
|
void XlatRusageToLinux(struct rusage_bits *, const struct rusage *);
|
|
void XlatItimervalToLinux(struct itimerval_bits *, const struct itimerval *);
|
|
void XlatLinuxToItimerval(struct itimerval *, const struct itimerval_bits *);
|
|
void XlatLinuxToTermios(struct termios *, const struct termios_bits *);
|
|
void XlatTermiosToLinux(struct termios_bits *, const struct termios *);
|
|
void XlatWinsizeToLinux(struct winsize_bits *, const struct winsize *);
|
|
void XlatSigsetToLinux(uint8_t[8], const sigset_t *);
|
|
void XlatLinuxToSigset(sigset_t *, const uint8_t[]);
|
|
|
|
COSMOPOLITAN_C_END_
|
|
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
|
|
#endif /* COSMOPOLITAN_TOOL_BUILD_LIB_XLAT_H_ */
|